| 斜发沸石对钾离子的吸附/解吸动力学研究 |
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| 引用本文： | 刘爱平,冯启明,王维清,和丽丽,刘岁海.斜发沸石对钾离子的吸附/解吸动力学研究[J].矿物岩石,2011,311(3). |
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| 作者姓名： | 刘爱平 冯启明 王维清 和丽丽 刘岁海 |
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| 作者单位： | 西南科技大学环境与资源学院,四川绵阳,621010 |
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| 基金项目： | 国家自然科学基金(40502008) |
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| 摘 要： | 以KCl为钾源、新疆某地所产斜发沸石为吸附剂,研究斜发沸石对K+的动力吸附与解吸效果,并探讨吸附时间、K+初始浓度与吸附量的关系。用pH=5的HCl溶液和(Ca2++Mg2+)浓度/(mmol.L-1)为1.6,3.2,6.4,12.8,19.2,25.6的混合溶液对饱和吸附了K+的斜发沸石进行解吸,实验结果表明:沸石对K+的吸附在4min能达到最大吸附率的96%,30min内达到平衡。Langmuir吸附等温式能对吸附曲线进行很好的描述。单位质量沸石对K+的最大吸附量为44.53×10-3,以阳离子交换吸附为主。pH=5的HCl溶液对K+的解吸量最小,随解吸溶液中(Ca2++Mg2+)浓度增加,解吸滞后系数减小,解吸速率远小于吸附速率。解吸量的自然对数与解吸时间的自然对数呈现明显的线性关系,用指数方程对(Ca2++Mg2+)浓度为25.6mmol/L的解吸曲线进行拟合,R=0.998,拟合方程为qt=3.890t0.210。理论上将吸附的K+全部解吸出来需要74.4d。
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| 关 键 词： | 斜发沸石 钾离子 动力吸附/解吸 阳离子交换 |
DYNAMIC STUDY OF ADSORPTION/DESORPTION OF CLINOPTILOTITE TO POTASSIUM(K~+) |
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| LIU Ai-ping,FENG Qi-ming,WANG Wei-qing,HE Li-li,LIU Sui-hai.DYNAMIC STUDY OF ADSORPTION/DESORPTION OF CLINOPTILOTITE TO POTASSIUM(K~+)[J].Journal of Mineralogy and Petrology,2011,311(3). |
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| Authors: | LIU Ai-ping FENG Qi-ming WANG Wei-qing HE Li-li LIU Sui-hai |
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| Institution: | LIU Ai-ping,FENG Qi-ming,WANG Wei-qing,HE Li-li,LIU Sui-hai College of Environment and Resources,Southwest University of Science and Technology,Mianyang 621010,China |
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| Abstract: | The clinoptilotite occurred in Xinjiang is taken as adsorbent to study the effect of adsorption/desorption of clinoptilotite on K+ and discuss the relation between amount of absorption and the absorption time as well as initial concentration of K+.Clinoptilotite adsorbed saturated K+ is desorbed by HCl solution(pH=5) and(Ca2++Mg2+) with concentration of 1.6,3.2,6.4,12.8,19.2,25.6 mmol/L.It is showed that the absorption of clinoptilotite to K+ reaches 96% at 4 minutes,getting balanced within 30 minutes,and t... |
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| Keywords: | clinoptilotite potash fertilizer adsorbing&desorbing kinetics cation exchange |
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